Dental instrument.



W. H.. MOSLEY.

DENTAL INSTRUMENT.

APPLICATION rum) NOV. 21, 1913.

Patented Nov. 3, 1914.

TH!v NORRIS PETERS 60., PHOTCVLITI-I WASHINGTCH. n (1 I WILLIAM HAROLDMosLEY, or tron-onto, ONTARIO, CANADA.

DENTAL insrmiivimv'r.

Specification of Letters Patent. 7

Application filerl Nove mber 21, 1913. Serial INo. 802,310.

To all whom it may concern Be it known that I, TILLIAM H. MOSLEY, acitizen of Canada, residing in Toronto, in the county of York, Provinceof Ontario, Canada, and a British subject, have invented a certain newand useful Dental Instrument, of which the following is a specification.

This invention is a dental instrument and relates more particularly tothe handpiece, which is designed as a device in which a bit or tool issecured and by which the tool is manipulated in performing dental work.

An object of this invention is to provide a hand instrument which canaccommodate various bits or tools which have heretofore beenmanufactured as a number of separate instruments, and thereby requireless stor-' age space, and lessen the cost of implements.

Another purpose of the invention is to provide a hand instrument,wherein various tools, such as burnishers, chisels, excavators, wrenchesand the like, may be inserted in a single handpiece and secured at anydesired angle with reference thereto, and

thereby facilitate their manipulation.

The handpiece is characterized by a handle having a reduced adjustableend provided with locking means. A sleeve is adapted to be positionedover this reduced end and to be adjustable thereon, the sleeve having asocket for a spherical tool-carrying member, the sleeve being providedwith means to bring the spherical member into engagement with lockingmeans on the reduced end of the handle to maintain the spherical memberin a predetermined position with relation to the handle.

One embodiment of the invention is illustrated in the accompanyingdrawings, in which Figure 1 is a side elevation of a handpiececonstructed in accordance with the invention. Fig. 2 is a side elevationwith the retaining sleeve and spherical tool carrying member removed.Fig. 3 is an enlarged detail view of the retaining sleeve. Fig. 4 is anenlarged detail view of the spherical tool carrying member, showinggrooves formed in its surface. Fig. 5 is a detail sectional view of theupper or threaded end of the hand-piece, showing projections to engagethe recesses or grooves on the spherical member of Fig. 4:.

In the embodiment of the invention illustrated in the drawings, thehandle, 1, may be provided with a polygonal surface toprevent theinstrument from rolling on an inclined surface. One end of the handlemay be'reduced, as at 2, and providedwith dle 1 is preferablv slightlyconcave, and may Patented N ov. 3, 1914.

external threads 3. The free end of the hanbe provided with suitableretaining means 1. r

A sleeve, 5, provided with a roughened surface, 6, is adapted to engagethe threaded end 3 of the handle, the sleeve being internally threadedto permit the adjustment of the sleeve on the handle. The sleeve 5 isopened at one end to permit of the insertion of the threaded end of thehandle, and it is partially closed at its other end 7. At the end 7, thesleeve may be provided with a socket and a slot 8, which extends fromthepartially opened end 7 down into a sidewall of the sleeve.

Loosely mounted within the sleeve5 is a spherical member 9 which isshown pro vided with a tool engaging projection 10 adapted to passbetween the walls of the slot 8 of the sleeve. A longitudinal passage 11may be formed through the member 9 and projection 10, into which may beinserted an end of a dental instrument, such as a chisel, excavator,burnisher, wrench,and the like, and this passage 11 may be threaded orprovided with any other suitable retaining means to hold the tool inposition on the member 9.

The outer surface of the member 9 may be roughened or scored, as at 12,whereby when the sleeve 5 is adjusted by the finger part 6, on thehandle end 3, toward the 12 of the member 9 and'serving to retain saidmember 9 against movement with re-' lation to the handle. This inventionwill permit a dentist to provide a single handpiece with a number ofhand-operated tools,

which can be retained at various angleswith relation to the handpiece.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A dental handpiece comprising a handle, a sleeve mounted on'thehandleto cooperate with one end thereof, and a spherical tool carryingmember positioned in the sleeve and adapted to be firmly held betweenthe end of the handle and an end of the sleeve to retain a dental toolin a predetermined position with relation to the handle.

2. A dental handpiece comprising a handle having a reduced threaded end,an internally threaded sleeve adapted to engage said end of the handle,said sleeve being provided with a socket near one end thereof, aspherical tool-carrying member mounted for substantially universalmovement in the socket and provided with a roughened surface, and meansat the'end of the handle to engage the roughened surface of thespherical member and retain said member in a desired position, whereby atool may be maintained at a desired angle with relation to the handle.

8; A dental handpiece comprising a han- Gopiesof this patent may beobtained for dle having a reduced threaded end, an inter nally threadedsleeve adapted to engage said end of the handle, said sleeve beingprovided with a socket and a slot extending from the end of the sleevedown the side thereof, a spherical tool carrying member having a toolengaging projection adapted to be moved into said slot of the sleeve,and means whereby the spherical member may be clamped between the endsof the handle and sleeve against movement, to permit a dental tool to beretained at various angular positions with relation to the handle.

WILLIAM HAROLD MOSLEY.

WVitnesses:

D. S. TovELL, H. M. CHRIs'rMAN.

five cents each, by addressing the Commissioner of Iatents,

Washington, D. G.

